论文部分内容阅读
图1是初中物理教材中给出的萘熔解的理想曲线。在此曲线中,隐含着一个条件:萘吸收的热量 Q_吸与吸热时间 t 成正比,即 Q_吸∝t。为说明这个问题,我们来考察一下 AB 段的物理意义:AB 段表示萘处于固态,它吸收热量,温度随之升高,两者关系满足公式:Q_吸=cm△T,式中,c 为比热,m 为质量,对一定数量的萘来说,cm 为常数。因此,△T∝Q_吸,即在 T-Q_吸图线中,AB 段应为直线;而要在 T-t 曲线中的 AB 段也为直线,显然必须要求 Q_吸
Figure 1 is an ideal curve for naphthalene melting given in junior high school physics textbooks. In this curve, a condition is implied: the heat absorbed by naphthalene Q_ suction is proportional to the time t of heat absorption, ie Q_ suction t. To illustrate this issue, let us examine the physical meaning of the AB segment: The AB segment indicates that the naphthalene is in a solid state. It absorbs heat and the temperature increases. The relationship between the two satisfies the formula: Q_suction = cmΔT, where c For specific heat, m is mass. For a certain number of naphthalenes, cm is a constant. Therefore, △T∝Q_Suck, that is, in the T-Q_Sucker line, the AB segment should be a straight line; and the AB segment in the T-t curve should also be a straight line, obviously Q_Suck must be required.